Mass Passing Through Origin

s=-6cos((pi*t)/6)


t=1 is incorrect (gives you s= -3sqrt(3))

t=3 is correct

t=5 is incorrect (gives you s= 3sqrt(3))

t=7 is incorrect (gives you s= 3sqrt(3))

t=9 is correct

t=11 is incorrect (gives you s= -3sqrt(3))

so, t=3,9,15,21 is correct

if you did the table first would be better

 

I completed the table. How can the table help me answer part (d)?

 

the table will help you to see for what values of t the value of s=0

 

Wow! Why didn't I see that? Boy, am I dumb.